Why Do Cats Spray? Causes & How Your Litter Box Can Help

August 19, 2026

Discovering that your cat has sprayed urine up a wall, a door or the side of the sofa is frustrating, but it isn't your cat being spiteful. Spraying is a normal way cats communicate, and it almost always means something in their world feels off. The good news is that once you understand what's behind it, spraying is usually something you can resolve. Below we explain why cats spray, how to tell spraying apart from ordinary peeing, and how the right litter box setup can help put a stop to it.

What is cat spraying?

Spraying, also called urine marking, is when a cat deposits a small amount of urine onto a vertical surface. You'll often spot the tell-tale posture: your cat backs up to a wall or piece of furniture, stands tall with the tail held upright and quivering, and may tread with the back feet. Rather than emptying the bladder, they leave a quick scent message.

That message can mean a few different things, including claiming territory, responding to stress, or signalling availability to mate. Both male and female cats spray, although cats that haven't been desexed do it far more often.

Cat spraying vs peeing: how to tell the difference

It's easy to lump all unwanted toileting together, but spraying and peeing outside the litter box are different behaviours with different fixes. Knowing which one you're dealing with saves a lot of guesswork.

Spraying: a small amount of urine on a vertical surface, with your cat standing and the tail quivering.
Inappropriate peeing: a full puddle on a horizontal surface such as a floor, rug or bed, with your cat squatting as it normally would in the tray.

If your cat is squatting and emptying its bladder outside the box, that usually points to litter box dissatisfaction or a medical issue. If it's standing and marking, you're looking at spraying. Either way, it's worth booking a vet check to rule out anything physical.

Why do cats spray? Common causes

Cat urine marking is rarely random. These are the most common triggers:

Territory - cats mark to stake a claim, which is why spraying often increases in multi-cat homes or when a cat can see unfamiliar cats through the window.
Stress and change - a new pet, a new baby, rearranged furniture, building work or a house move can all unsettle a cat enough to start marking.
Hormones - cats that haven't been desexed are far more likely to spray, males especially.
Litter box problems - a tray that's dirty, in a busy or exposed spot, or simply not to your cat's taste can push them to mark elsewhere.
Medical issues - urinary tract infections, cystitis and bladder stones can all change toileting behaviour, so always rule these out with your vet first.

How the right litter box setup can help

For a lot of cats, getting the litter box right removes the trigger for spraying altogether. Here's what makes the biggest difference:

Enough boxes - follow the n+1 rule: one tray per cat, plus one spare. In a two-cat home, that means three trays.
The right location- place trays in quiet, low-traffic spots where your cat can see what's coming and won't feel cornered, away from food bowls and noisy appliances.
A style your cat likes- some cats prefer the privacy of a covered tray, while others feel trapped by one, so offering a choice helps you learn what your cat actually wants.
Cleanliness - scoop at least once a day, as a spotless tray is one of the simplest ways to discourage marking.
Size - bigger is almost always better, since a cramped tray puts cats off.

A good litter box for spraying cats is simply one that feels safe, private and clean every single time they use it.

It's worth exploring our range of cat litter boxes, including enclosed litter boxes for privacy-loving cats and self-cleaning litter boxes that stay fresh between scoops.

Other ways to stop cat spraying

Alongside the litter box, a few extra steps make a real difference when you're working out how to stop cat spraying:

Desex your cat- this resolves marking for the majority of cats and is the single most effective step.
Clean sprayed spots properly - use an enzymatic cleaner rather than anything ammonia-based, as leftover scent invites your cat to re-mark.
Try pheromone diffusers- synthetic calming pheromones can help take the edge off an anxious cat.
Reduce stress- add vertical space, hiding spots and predictable routines, and block the view of outdoor cats if that's a trigger.
Reintroduce change slowly- after a move or a new arrival, give your cat time and space to adjust.

If spraying continues despite all of this, go back to your vet, as persistent marking sometimes needs a tailored behaviour plan.